clinton has had a blood clot in the past. in 1998, behind her right knee, after a year of heavy travel. this clot comes at the end of the most demanding period of her life as she recently told abc's barbara walters. >> are you exhausted? >> i am. to be honest, i am. when i do something, i really want to do it to the best of my ability. that means i pretty much work all the time. >> reporter: what is unclear is whether she'll be able to return to her full-time role at the state department before a new secretary of state is sworn in. doctors say she'll be released from the hospital once the proper medication dose is determined. they say she is making excellent progress and are confident she'll make a full recovery. she's reportedly in good spirits, engaging with doctors, family and staff. martha raddatz, abc news, washington. >> it's good that this stroke -- i'm sorry, the clot did not cause a stroke or any neurological damage, that they found it during a routine mri, and it formed -- it was very rare that this actually formed